/*
 * Copyright (C) 2014 Eduardo Pereira Montenegro <epereiramontenegro@gmail.com>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package com.googlecode.bambole.util;

/**
 *
 * @author Eduardo Pereira Montenegro <epereiramontenegro@gmail.com>
 */
public class DiscountUtil {

    public static double calculateDiscount(double currentAmount, double newAmount) {
        return currentAmount == 0 ? 0 : (1 - newAmount / currentAmount) * 100;
    }

    public static double calculateAmount(double amount, double discount) {
        return amount - (amount * discount / 100);
    }
}
